This paper presents a state-of-the-art review on a hot topic in the literature, i.e., vibration based energy harvesting techniques, including theory, modelling methods and the realizations of the piezoelectric, electromagnetic and electrostatic approaches. To minimize the requirement of external power source and maintenance for electric devices such as wireless sensor networks, the energy harvesting technique based on vibrations has been a dynamic field of studying interest over past years. One important limitation of existing energy harvesting techniques is that the power output performance is seriously subject to the resonant frequencies of ambient vibrations, which are often random and broadband. To solve this problem, researchers have concentrated on developing efficient energy harvesters by adopting new materials and optimising the harvesting devices. Particularly, among these approaches, different types of energy harvesters have been designed with consideration of nonlinear characteristics so that the frequency bandwidth for effective energy harvesting of energy harvesters can be broadened. This paper reviews three main and important vibration-to-electricity conversion mechanisms, their design theory or methods and potential applications in the literature. As one of important factors to estimate the power output performance, the energy conversion efficiency of different conversion mechanisms is also summarised. Finally, the challenging issues based on the existing methods and future requirement of energy harvesting are discussed.

A comprehensive review on vibration energy harvesting: Modelling and realization

The injected fluids in secondary processes supplement the natural energy present in the reservoir to displace oil. The recovery efficiency mainly depends on the mechanism of pressure maintenance. However, the injected fluids in tertiary or enhanced oil recovery (EOR) processes interact with the reservoir rock/oil system. Thus, EOR techniques are receiving substantial attention worldwide as the available oil resources are declining. However, some challenges, such as low sweep efficiency, high costs and potential formation damage, still hinder the further application of these EOR technologies. Current studies on nanoparticles are seen as potential solutions to most of the challenges associated with these traditional EOR techniques. This paper provides an overview of the latest studies about the use of nanoparticles to enhance oil recovery and paves the way for researchers who are interested in the integration of these progresses. The first part of this paper addresses studies about the major EOR mechanisms of nanoparticles used in the forms of nanofluids, nanoemulsions and nanocatalysts, including disjoining pressure, viscosity increase of injection fluids, preventing asphaltene precipitation, wettability alteration and interfacial tension reduction. This part is followed by a review of the most important research regarding various novel nano-assisted EOR methods where nanoparticles are used to target various existing thermal, chemical and gas methods. Finally, this review identifies the challenges and opportunities for future study regarding application of nanoparticles in EOR processes.

/pdf/application-of-nanoparticles-in-enhanced-oil-recovery-a-3phymk4cb9.pdf

Application of Nanoparticles in Enhanced Oil Recovery: A Critical Review of Recent Progress

Recent advances in micro-vibration isolation

Nonlinear dynamic characteristics of a quasi-zero stiffness vibration isolator with cam–roller–spring mechanisms

Vibration isolation characteristics of a nonlinear isolator using Euler buckled beam as negative stiffness corrector: A theoretical and experimental study

A comparison of two nonlinear damping mechanisms in a vibration isolator

On the shock performance of a nonlinear vibration isolator with high-static-low-dynamic-stiffness

\n Mechanical shock is a common problem that is present in many situations, such as ground motion, blast, explosions, crash, and impact. The development of passive, active, or adaptive control and isolation strategies for shock-induced vibration has experienced recent interest, typically due to the increasing demand in improved isolation requirements for sensitive equipment subjected to harsh environments. This paper presents a review of some of the significant recent works developed in the field, focusing on novel developments that contribute to the shock isolation. The article explores several isolation approaches considering passive, active, and nonlinear systems discussing both theoretical and experimental results. In addition, important outcomes of the work are reviewed. The paper concludes with suggestions for potential developments, applications, and recommendations for future research.

Bin Tang

Papers

A comparison of two nonlinear damping mechanisms in a vibration isolator

On the shock performance of a nonlinear vibration isolator with high-static-low-dynamic-stiffness

Recent Advances in Shock Vibration Isolation: An Overview and Future Possibilities

Some diverse examples of exploiting the beneficial effects of geometric stiffness nonlinearity

An experimental nonlinear low dynamic stiffness device for shock isolation